Thermal spraying equipment for PCB (printed circuit board) of electronic and electrical equipment

Abstract

The invention relates to the technical field of thermal spraying, and discloses thermal spraying equipment for electronic and electrical equipment PCBs, the thermal spraying equipment comprises a tooth holder, a material ring, a sealing ring and a spray head, the rear end of the spray head is fixedly connected with an adjusting mechanism, the adjusting mechanism comprises a guide frame, an inner cavity of the guide frame is rotatably connected with a conical tooth column, the conical tooth column is movably sleeved with a worm block, and the worm block is fixedly connected with the material ring. The inner wall of the left side of the guide frame is rotationally connected with a hinge plate. According to the thermal spraying equipment for the electronic and electrical equipment PCBs, the negative suction strips revolve relative to the PCBs and move back and forth in the opposite directions, so that scattered vaporific spraying materials with the height lower than the spraying range are fully sucked and recycled, when one side face of each PCB is sprayed, the other side face is cooled in time, and the spraying efficiency is improved. Therefore, spraying uniformity is guaranteed, unused spraying materials are recycled, and the coating effect and the heat dissipation effect of multi-layer spraying are enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of thermal spraying, and in particular to a thermal spraying device for PCB boards of electronic and electrical equipment. Background Art

[0002] Thermal spraying is a process that uses flames, electric arcs, plasma arcs and other heat sources to heat the spray material to a molten or semi-molten state, and then atomizes the material. The atomized particles fly and hit the material surface to cool and form a coating. At present, it is necessary to perform plasma thermal spraying on PCB boards of electronic and electrical equipment. During the spraying period, in order to prevent excess mist spray material from scattering to the processing ground, the conventional treatment is to use a turbofan to absorb it at the bottom of the spraying area, but it will cause large air flow fluctuations, so that the spray material cannot be fully utilized during the spraying process, but is directly affected by the downward force and cannot be evenly covered on the surface of the PCB board. Since the conventional spraying method adopts the form of reciprocating spraying on each side of the PCB board, it is difficult for a single layer of spray material to cool quickly, and then it is difficult for subsequent coatings to be effectively applied. After a single PCB board is sprayed, it is necessary to wait for it to cool naturally before spraying the subsequent PCB board, which leads to a decrease in processing efficiency. Summary of the invention

[0003] In order to solve the problems of poor uniformity of spraying and recovery mechanism of unused spraying materials, poor coating effect and heat dissipation effect of multi-layer spraying in the process of using the above-mentioned general thermal spraying equipment for PCB boards of electronic and electrical equipment, and to achieve the above purpose of ensuring uniformity of spraying and recovery of unused spraying materials, and strengthening coating effect and heat dissipation effect of multi-layer spraying, the present invention is achieved through the following technical scheme: A thermal spraying equipment for PCB boards of electronic and electrical equipment, including a gear seat, a material ring, a sealing ring, and a nozzle, the rear end of the nozzle is fixedly connected with an adjustment mechanism, the adjustment mechanism includes a guide frame, the inner cavity of the guide frame is rotatably connected with a conical tooth column, a worm block is movably sleeved on the conical tooth column, a page plate is rotatably connected to the inner wall of the left side of the guide frame, and a bag sleeve is fixedly connected between the upper and lower side surfaces of the page plate and the inner wall of the guide frame, the upper and lower sides of the guide frame are slidably connected with negative suction strips, a hinge rod is movably connected between the negative suction strip and the worm block, a negative suction groove is opened at the front end of the negative suction strip, and a three-way pipe is fixedly connected to the upper and lower sides of the rear end of the guide frame.

[0004] Furthermore, a material ring is fixedly connected to the periphery of the gear seat, a sealing ring is rotatably connected to the inner wall of the material ring, and a nozzle is fixedly connected to the inner wall on the left side of the sealing ring.

[0005] Furthermore, a hemispherical cavity corresponding to the page plate is opened at the left end of the guide frame, and one-way inlet grooves are opened on the upper and lower sides of the rear wall of the hemispherical cavity. The one-way inlet grooves correspond to the bag sleeves on the upper and lower sides respectively, so that when the page plate reciprocates, there is always a bag sleeve that can inhale external air and then discharge it through the three-way pipe.

[0006] Furthermore, the bevel gear column is meshingly connected with the gear seat, a closed-loop curved groove is provided on the surface of the bevel gear column, the inner wall of the worm block includes a protruding portion extending into the closed-loop curved groove, the worm block is slidingly connected with the guide frame, and the worm block is meshingly connected with the page plate, so that when the guide frame revolves around the gear seat, the bevel gear column can mesh and rotate to make the worm block move back and forth, thereby driving the page plate to deflect back and forth, and replenishing air into the equipment to enable the negative suction strip to operate.

[0007] Furthermore, the two ends of the three-way pipe away from the guide frame are respectively connected to the negative suction groove, the three-way pipe is buried inside the negative suction strip, and the top of the negative suction groove includes an inclined boosting groove connected to the three-way pipe, so that when any three-way pipe passes pressurized air into the negative suction groove through the inclined boosting groove, the port part of the negative suction groove close to the outside world can form a negative pressure field based on the Bernoulli principle, thereby facilitating the recovery of the falling mist spray material.

[0008] Furthermore, it also includes an insulating ring, a filter block, and a cooling mechanism. The insulating ring is fixedly connected to the bottom of the nozzle, the filter block is fixedly connected to the outer periphery of the insulating ring, and a cooling mechanism is fixedly installed in the middle of the front end of the gear seat. The cooling mechanism includes a magnetic column, and a positioning cylinder is fixedly connected to the front end of the magnetic column. Telescopic electromagnetic aluminum plates are slidably inserted on the left and right sides of the front end of the positioning cylinder, and two symmetrical actuating rods are fixedly connected to the right end of the magnetic column. Convex layers are fixedly installed on the left and right sides of the inner wall of the insulating ring.

[0009] Furthermore, the side of the touch rod close to the front end of the magnetic column is electrically connected to the telescopic electromagnetic aluminum plate on the right side, and the side of the touch rod close to the rear end of the magnetic column is electrically connected to the telescopic electromagnetic aluminum plate on the left side. The convex layers are on both sides of the inner wall of the insulating ring and are offset front and back in the axial direction. After the telescopic electromagnetic aluminum plate is energized, the magnetic poles of the adjacent surface of the magnetic column are the same. Initially, the convex layer on the right side is positioned forward than the convex layer on the left side, so that the touch rod on the front side is abutted, and then the telescopic electromagnetic aluminum plate on the right side is energized to repel the magnetic column and extend out, so as to be close to the sprayed PCB board for cooling of this side.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. The thermal spraying equipment for PCB boards of electronic and electrical equipment positions the PCB board at the top area of ​​the negative suction strip, controls the external drive to drive the sealing ring to rotate and spray the nozzle, during which the conical tooth column is engaged with the tooth seat to make the worm block reciprocate inside the guide frame, so as to drive the leaf plate to deflect back and forth, and continuously replenish air to the three-way pipe, so that the three-way pipe passes the pressurized air to the negative suction groove through the inclined supercharging groove, so that the port part of the negative suction groove close to the outside world forms a negative pressure field based on the Bernoulli principle, and at the same time, the hinge rod drives the negative suction strips on both sides to move back and forth and toward each other, and because the negative suction strips are also driven to revolve, it is convenient to fully absorb and recover the scattered mist spray material whose height is lower than the spraying range. This design avoids causing large airflow fluctuations, resulting in the spray material being directly subjected to a downward force during the spraying process, and failing to evenly cover the surface of the PCB board, and can effectively recover the unused spray material.

[0011] 2. The thermal spraying equipment for PCB boards of electronic and electrical equipment positions the PCB board on the surface of the positioning cylinder. When the nozzle rotates to the left side of the PCB board for spraying, the front trigger rod is abutted by the convex layer at the front of the right side, so that the telescopic electromagnetic aluminum plate on the right side can be electrified to repel the magnetic column and extend to get close to the sprayed PCB board to cool down the side. When the nozzle rotates to the right side of the PCB board, that is, the cooled side, for spraying, the rear trigger rod is abutted by the convex layer at the back of the original left side, so that the telescopic electromagnetic aluminum plate on the left side can be electrified to repel the magnetic column and extend to get close to the side of the PCB board that has just been sprayed to cool down the side. This design enhances the coating effect and heat dissipation effect of multi-layer spraying. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a main cross-sectional view of the present invention; Figure 2 It is a left sectional view of the connection part of the negative suction strip of the present invention; Figure 3 It is a front cross-sectional view of the connecting portion of the page plate of the present invention; Figure 4 It is a top sectional view of the connection part of the positioning tube of the present invention; Figure 5 It is a left sectional view of the connecting portion of the page plate of the present invention; Figure 6 It is a front cross-sectional view of the material ring connecting portion of the present invention.

[0013] In the figure: 1. tooth seat; 2. material ring; 3. sealing ring; 4. nozzle; 5. insulating ring; 6. filter block; 7. adjustment mechanism; 71. guide frame; 72. conical gear column; 73. worm block; 74. leaf plate; 75. bag sleeve; 76. negative suction strip; 77. hinge rod; 78. negative suction groove; 79. three-way pipe; 8. cooling mechanism; 81. magnetic column; 82. positioning cylinder; 83. telescopic electromagnetic aluminum plate; 84. trigger rod; 85. convex layer. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] The embodiment of the thermal spraying equipment for PCB board of electronic and electrical equipment is as follows: See also Figure 1-Figure 6 A thermal spraying device for PCB boards of electronic and electrical equipment includes a gear seat 1, a material ring 2, a sealing ring 3, and a nozzle 4. The outer periphery of the gear seat 1 is fixedly connected with the material ring 2, the inner wall of the material ring 2 is rotatably connected with the sealing ring 3, the inner wall on the left side of the sealing ring 3 is fixedly connected with the nozzle 4, and the rear end of the nozzle 4 is fixedly connected with an adjusting mechanism 7. The adjusting mechanism 7 includes a guide frame 71, and a hemispherical cavity corresponding to a page plate 74 is opened at the left end of the guide frame 71. One-way inlet grooves are opened on the upper and lower sides of the rear wall of the hemispherical cavity. The one-way inlet grooves correspond to the bag sleeves 75 on the upper and lower sides respectively, so that when the page plate 74 is reciprocated and deflected, there is always a bag sleeve 75 that can inhale external air and then discharge it through the three-way pipe 79.

[0016] A bevel gear column 72 is rotatably connected to the inner cavity of the guide frame 71, and the bevel gear column 72 is meshingly connected to the gear seat 1. A closed-loop curved groove is provided on the surface of the bevel gear column 72, and the inner wall of the worm block 73 includes a protruding portion extending into the closed-loop curved groove. The worm block 73 is slidably connected to the guide frame 71, and the worm block 73 is meshingly connected to the page plate 74, so that when the guide frame 71 revolves around the gear seat 1, the bevel gear column 72 can mesh and rotate to make the worm block 73 move back and forth, thereby driving the page plate 74 to deflect back and forth, and replenishing air into the equipment to enable the negative suction strip 76 to operate.

[0017] A worm block 73 is movably sleeved on the conical gear column 72, and a page plate 74 is rotatably connected to the inner wall of the left side of the guide frame 71. Bag sleeves 75 are fixedly connected between the upper and lower surfaces of the page plate 74 and the inner wall of the guide frame 71. Negative suction strips 76 are slidably connected to the upper and lower sides of the guide frame 71. The negative suction groove 78 inside the negative suction strip 76 is through-connected with the filter block 6, so that the filter block 6 can be used to filter and retain the absorbed paint.

[0018] A hinge rod 77 is movably connected between the negative suction strip 76 and the worm block 73, a negative suction groove 78 is provided at the front end of the negative suction strip 76, and a three-way pipe 79 is fixedly connected to the upper and lower sides of the rear end of the guide frame 71, and the two ends of the three-way pipe 79 away from the guide frame 71 are respectively connected to the negative suction groove 78, and the three-way pipe 79 is buried inside the negative suction strip 76. The top of the negative suction groove 78 includes an inclined boosting groove connected to the three-way pipe 79, so that when any three-way pipe 79 passes pressurized air into the negative suction groove 78 through the inclined boosting groove, the port part of the negative suction groove 78 close to the outside can form a negative pressure field based on the Bernoulli principle, thereby facilitating the recovery of the falling mist spray material.

[0019] After the PCB board is positioned in the top area of ​​the negative suction strip 76, the external drive is controlled to drive the sealing ring 3 to rotate and spray the nozzle 4. During this period, the conical tooth column 72 is engaged with the tooth seat 1 to make the worm block 73 move back and forth inside the guide frame 71, so as to drive the leaf plate 74 to deflect back and forth, and continuously replenish air to the three-way pipe 79, so that the three-way pipe 79 can pass pressurized air to the negative suction groove 78 through the inclined supercharging groove, so that the port part of the negative suction groove 78 close to the outside world forms a negative pressure field based on the Bernoulli principle. At the same time, the hinge rod 77 drives the negative suction strips 76 on both sides to move back and forth and towards each other, and because the negative suction strips 76 are also driven to revolve, it is convenient to fully absorb and recover the scattered mist spray material whose height is lower than the spraying range. This design avoids causing large airflow fluctuations, resulting in the spray material being directly subjected to a downward force during the spraying process, and failing to evenly cover the surface of the PCB board, and can effectively recover the unused spray material.

[0020] The insulating ring 5 is fixedly connected to the bottom of the nozzle 4, the filter block 6 is fixedly connected to the outer periphery of the insulating ring 5, and a cooling mechanism 8 is fixedly installed in the middle of the front end of the gear seat 1. The cooling mechanism 8 includes a magnetic column 81, and a positioning cylinder 82 is fixedly connected to the front end of the magnetic column 81. The front end surface of the positioning cylinder 82 is provided with an elastic card groove for positioning the PCB board. The left and right sides of the front end of the positioning cylinder 82 are slidably plugged with telescopic electromagnetic aluminum plates 83. The right end of the magnetic column 81 is fixedly connected with two symmetrical touch rods 84. The side of the touch rod 84 close to the front end of the magnetic column 81 is electrically connected to the right side telescopic electromagnetic aluminum plate 83. The touch rod 8 The side close to the rear end of the magnetic column 81 is electrically connected to the telescopic electromagnetic aluminum plate 83 on the left side. The convex layers 85 are located on both sides of the inner wall of the insulating ring 5 and are displaced front and back in the axial direction. After the telescopic electromagnetic aluminum plate 83 is energized, the magnetic poles of the adjacent surface of the magnetic column 81 are the same. Initially, the convex layer 85 on the right side is located closer to the front side than the convex layer 85 on the left side, so that the front side of the trigger rod 84 is abutted, and then the telescopic electromagnetic aluminum plate 83 on the right side is energized to repel the magnetic column 81 and extend out to be close to the sprayed PCB board for cooling on this side. The convex layers 85 are fixedly installed on both sides of the inner wall of the insulating ring 5.

[0021] After the PCB board is positioned on the surface of the positioning cylinder 82, when the nozzle 4 rotates to the left side of the PCB board for spraying, the front trigger rod 84 is abutted by the convex layer 85 at the front of the right side, so that the telescopic electromagnetic aluminum plate 83 on the right side can be energized to repel the magnetic column 81 and extend out to get close to the sprayed PCB board for cooling down this side. When the nozzle 4 rotates to the right side of the PCB board, that is, the cooled side, for spraying, the rear trigger rod 84 is abutted by the convex layer 85 at the rear of the original left side, so that the telescopic electromagnetic aluminum plate 83 on the left side can be energized to repel the magnetic column 81 and extend out to get close to the side of the PCB board that has just been sprayed and cool down this side. This design thereby enhances the coating effect and heat dissipation effect of multi-layer spraying.

[0022] Working principle: When in use, the device is placed vertically on the ground so that the magnetic column 81 is facing upward, and the PCB board is clamped and positioned on the surface of the positioning cylinder 82, and the external drive is controlled to drive the sealing ring 3 to rotate, and the nozzle 4 is synchronously controlled to operate, so that the nozzle 4 can suck the hot paint in the material ring 2 for rotational spraying. During this period, the conical tooth column 72 is meshed and guided by the tooth seat 1 to rotate, so that the worm block 73 can reciprocate inside the guide frame 71 to drive the page plate 74 to reciprocate. Since the page plate 74 intermittently squeezes the upper and lower sides respectively, The bag sleeve 75 can then use the one-way inlet groove to continuously replenish air into the three-way pipe 79, so that the three-way pipe 79 can pass the pressurized air into the negative suction groove 78 through the inclined supercharging groove, so that the negative suction groove 78 close to the outside port portion forms a negative pressure field based on the Bernoulli principle. At the same time, the worm block 73 uses the hinge rod 77 to drive the negative suction strips 76 on both sides to move back and forth and towards each other, and the negative suction strips 76 are also driven to revolve, so as to facilitate the scattered mist spray material with a height lower than the spray range to be fully sprayed. The design avoids causing large air flow fluctuations, which causes the spray material to be directly subjected to a downward force during spraying and fail to evenly cover the surface of the PCB board, and can effectively recycle the unused spray material. The recycled paint enters the filter block 6 and is filtered and retained. During spraying, when the nozzle 4 rotates to the left side of the PCB board for spraying, the front touch rod 84 is abutted by the convex layer 85 at the front right position, so that the right telescopic electromagnetic aluminum plate 83 can be electrified to repel the magnetic column 81 and extend to approach the sprayed PCB board for cooling and cooling the side. When the nozzle 4 rotates to the right side of the PCB board, that is, the cooled side, for spraying, the rear touch rod 84 is abutted by the convex layer 85 at the rear left position, so that the left telescopic electromagnetic aluminum plate 83 can be electrified to repel the magnetic column 81 and extend to approach the side of the PCB board that has just been sprayed and cool the side. This design enhances the coating effect and heat dissipation effect of multi-layer spraying.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thermal spraying device for PCB boards of electronic and electrical equipment, comprising a gear holder (1), a material ring (2), a sealing ring (3), and a nozzle (4), characterized in that: The rear end of the nozzle (4) is fixedly connected to an adjusting mechanism (7), the adjusting mechanism (7) comprising a guide frame (71), the inner cavity of the guide frame (71) is rotatably connected to a conical tooth column (72), a worm block (73) is movably sleeved on the conical tooth column (72), a page plate (74) is rotatably connected to the inner wall of the left side of the guide frame (71), a bag sleeve (75) is fixedly connected between the upper and lower surfaces of the page plate (74) and the inner wall of the guide frame (71), the upper and lower sides of the guide frame (71) are slidably connected to negative suction strips (76), a hinge rod (77) is movably connected between the negative suction strip (76) and the worm block (73), a negative suction groove (78) is provided at the front end of the negative suction strip (76), and the upper and lower sides of the rear end of the guide frame (71) are fixedly connected to three-way pipes (79).

2. The thermal spraying equipment for PCB boards of electronic and electrical equipment according to claim 1 is characterized in that: A material ring (2) is fixedly connected to the periphery of the tooth seat (1), a sealing ring (3) is rotatably connected to the inner wall of the material ring (2), and a nozzle (4) is fixedly connected to the inner wall on the left side of the sealing ring (3).

3. The thermal spraying equipment for PCB boards of electronic and electrical equipment according to claim 1 is characterized in that: A hemispherical cavity corresponding to the leaf plate (74) is formed at the left end of the guide frame (71), and one-way inflow grooves are formed on both upper and lower sides of the rear wall of the hemispherical cavity.

4. The thermal spraying equipment for PCB boards of electronic and electrical equipment according to claim 1 is characterized in that: The conical tooth column (72) is meshingly connected to the tooth seat (1).

5. The thermal spraying equipment for PCB boards of electronic and electrical equipment according to claim 1, characterized in that: A closed-loop curved groove is formed on the surface of the conical tooth column (72), and an inner wall of the worm block (73) includes a protruding portion extending into the closed-loop curved groove.

6. The thermal spraying equipment for PCB boards of electronic and electrical equipment according to claim 1, characterized in that: The worm block (73) is meshingly connected to the leaf plate (74).

7. The thermal spraying equipment for PCB boards of electronic and electrical equipment according to claim 1, characterized in that: The two ends of the three-way pipe (79) away from the guide frame (71) are respectively connected to the negative suction groove (78), the three-way pipe (79) is buried inside the negative suction strip (76), and the top of the negative suction groove (78) includes an inclined boosting groove connected to the three-way pipe (79).

8. The thermal spraying equipment for PCB boards of electronic and electrical equipment according to claim 1, characterized in that: It also comprises an insulating ring (5), a filter block (6), and a cooling mechanism (8), wherein the insulating ring (5) is fixedly connected to the bottom of the nozzle (4), the filter block (6) is fixedly connected to the outer periphery of the insulating ring (5), a cooling mechanism (8) is fixedly installed at the middle of the front end of the tooth seat (1), the cooling mechanism (8) comprises a magnetic column (81), a positioning cylinder (82) is fixedly connected to the front end of the magnetic column (81), a telescopic electromagnetic aluminum plate (83) is slidably inserted on both the left and right sides of the front end of the positioning cylinder (82), two symmetrical actuating rods (84) are fixedly connected to the right end of the magnetic column (81), and convex layers (85) are fixedly installed on both the left and right sides of the inner wall of the insulating ring (5).

9. The thermal spraying equipment for PCB boards of electronic and electrical equipment according to claim 8, characterized in that: A side of the actuating rod (84) close to the front end of the magnetic column (81) is electrically connected to the telescopic electromagnetic aluminum plate (83) on the right side, and a side of the actuating rod (84) close to the rear end of the magnetic column (81) is electrically connected to the telescopic electromagnetic aluminum plate (83) on the left side.

10. The thermal spraying equipment for PCB boards of electronic and electrical equipment according to claim 8, characterized in that: The convex layers (85) are located on both sides of the inner wall of the insulating ring (5) and are offset front to back in the axial direction.

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